By Katina Caraganis

MediaNews

TOWNSEND -- An accident in which a teen driver struck and killed a resident walking his dog in September remains under investigation, according to a spokeswoman with the Middlesex District Attorney's office.

Gary Garafola, 57, was walking his dog down Wallace Hill Road in Townsend in Sept. 22 when he was struck and killed by 19-year-old Trevor Thompson, who was driving an Infiniti sedan.

Garafola was taken to Nashoba Valley Medical Center in Ayer, where he was pronounced dead.

The exact circumstances surrounding the case remain under investigation, according to Stephanie Guyotte, a spokeswoman for the Middlesex District Attorney's office.

"The investigation is still ongoing. It's a very active and ongoing investigation at this point," she said.

Garafola's 10-year-old black Labrador retriever Luke ran away before emergency responders arrived on scene but returned home safely days after the accident. Townsend's dog officer Mary Letourneau, in conjunction with countless volunteers, scoured the area looking for the dog. While they were looking, the Garafola family heard a dog barking at their back door.

He did not appear to have any injuries, Letourneau said, and Garafola and Luke were known to have walk in the area and took the same route on their daily walks.

Charges may be forthcoming, Guyotte said, but to date, none have been filed.

Calls to the Townsend Police Department were not returned Tuesday.

Follow Katina Caraganis on Twitter @kcaraganis.